Combining Texts

You have chosen 'Remarks on the definition and nature of mathematics' by Haskell B. Curry, 'On Certainty' by Ludwig Wittgenstein and 'System of Logic' by John Stuart Mill

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories